Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7813770c1cdf54f…

MALICIOUS

PDF

92.2 KB Created: 2021-08-08 22:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62a456202e9e9efa84f700a78a2ae870 SHA-1: 2982361931c57637f03b11f5fc3e4f8d85d16f8a SHA-256: e7813770c1cdf54f9bc15ba40f0b18cf4cf29a032adfb0174d1c9789cc2f76a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2072053d---70263594214.pdf In PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/desuvekipikesojelube.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4dbda2de9---refivemivavejowalog.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/fapogiwekuvutaxa.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/porinewipowaguzixovin.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/85340253935.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c58573a71c40cfad5c598e23904ec171/45640591332.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/lubudokadifavo.pdfIn PDF document text
    • http://poultech.net/d/files/24914161027.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/veludova.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/vovatolopotulifixu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dca855a6c9---38442841776.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c177cef23da---begebaxifabaw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b6562805327f4184875c6b92743fa8ff/32289279810.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/9247136c54rb5tlj4tr572r91b/rofelo.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/bafezev.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/44718592761.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd49ccf183---69137308022.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lelazemet.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///16512631961.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94da056a01---suvizesowurerewusow.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4a4d4763---vabaporesatosabu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/43797926333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=alight+motion+pro+mod+apk+2021+no+watermarkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 17236 bytes
SHA-256: c7cb8be7cec85d3f12f970dbe65a829a3c7617126223bf9b5e7a179a47948141
font_02_sfnt_off000130b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 11124 bytes
SHA-256: d17e96d0da84f1924bd567e542191861e8aa3e6ba3fab47005a4257f19460072
font_03_sfnt_off00014a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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